No, it doesn't. Becoming a servant, indeed a slave of God, abrogates your right to expect anything; it has nothing to do with your status, promotion, position or honor in God's world. God calls you and you accept to serve. No other condition exists. If you are willing to serve God unconditionally, then let God decide who will be a saint. Don't expect it in return for your service.
If it is from a love of God and desire to do His will, then yes.
Nope. It's not a contract. It's a submission.
My family is German (Saxon actually) and when you love God, it isn't like a contract. Kind of hard to explain in a way, but it involves more duty than the American E Free churches talk about. Even Duty isn't quite the right word.
Dang it, the Ouzo from the local Greek fest isn't helping this, I will try again later.